Vapour Pressure

Vapour pressure is the absolute pressure (also saturated steam pressure) which the vapour of a substance assumes in equilibrium with its liquid or solid phase, whereby in centrifugal pump technology only the transition between gaseous and liquid phase is of significance.

The vapour pressure of the pumped fluid greatly influences Cavitation Behaviour and thus the System NPSHavailable.

The vapour pressure is one of the important liquid properties for pump selection and depends on the fluid temperature.

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Pump Selection

Centrifugal pumps should be selected such that the specified System Duty Point is located on or as near as possible to the point of maximum efficiency (Pump Duty Point) of the max. speed H/Q-curve.

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